eu.etaxonomy.taxeditor.editor/src/main/java/eu/etaxonomy/taxeditor/editor/key/polytomous/handler/DeleteNodeHandler.java

   1 // $Id$
   2 /**
   3  * Copyright (C) 2007 EDIT
   4  * European Distributed Institute of Taxonomy
   5  * http://www.e-taxonomy.eu
   6  *
   7  * The contents of this file are subject to the Mozilla Public License Version 1.1
   8  * See LICENSE.TXT at the top of this package for the full license terms.
   9  */
  10
  11 package eu.etaxonomy.taxeditor.editor.key.polytomous.handler;
  12
  13 import org.eclipse.core.commands.ExecutionEvent;
  14 import org.eclipse.core.commands.ExecutionException;
  15 import org.eclipse.core.commands.common.NotDefinedException;
  16 import org.eclipse.core.commands.operations.AbstractOperation;
  17 import org.eclipse.core.commands.operations.IUndoContext;
  18 import org.eclipse.core.runtime.IStatus;
  19 import org.eclipse.core.runtime.Status;
  20 import org.eclipse.jface.dialogs.MessageDialog;
  21 import org.eclipse.jface.viewers.IStructuredSelection;
  22 import org.eclipse.ui.IEditorPart;
  23 import org.eclipse.ui.handlers.HandlerUtil;
  24
  25 import eu.etaxonomy.cdm.hibernate.HibernateProxyHelper;
  26 import eu.etaxonomy.cdm.model.description.PolytomousKeyNode;
  27 import eu.etaxonomy.taxeditor.editor.EditorUtil;
  28 import eu.etaxonomy.taxeditor.editor.key.KeyEditor;
  29 import eu.etaxonomy.taxeditor.editor.key.polytomous.IPolytomousKeyEditorPage;
  30 import eu.etaxonomy.taxeditor.editor.key.polytomous.PolytomousKeyEditorLabels;
  31 import eu.etaxonomy.taxeditor.editor.key.polytomous.PolytomousKeyListEditor;
  32 import eu.etaxonomy.taxeditor.editor.key.polytomous.operation.DeleteNodeOperation;
  33 import eu.etaxonomy.taxeditor.model.MessagingUtils;
  34 import eu.etaxonomy.taxeditor.operation.AbstractPostOperation;
  35
  36 /**
  37  * @author n.hoffmann
  38  * @created Dec 6, 2010
  39  * @version 1.0
  40  */
  41 public class DeleteNodeHandler extends AbstractPolytomousKeyNodeHandler {
  42
  43
  44     PolytomousKeyNode nodeToBeDeleted;
  45     /**
  46      * @param label
  47      */
  48     public DeleteNodeHandler(String label) {
  49         super(label);
  50
  51     }
  52
  53
  54
  55     public DeleteNodeHandler() {
  56         super(PolytomousKeyEditorLabels.DELETE_NODE_POLYTOMOUS_KEY_NODE_LABEL);
  57     }
  58
  59         /*
  60          * (non-Javadoc)
  61          *
  62          * @see
  63          * org.eclipse.core.commands.IHandler#execute(org.eclipse.core.commands.
  64          * ExecutionEvent)
  65          */
  66         @Override
  67         public Object execute(ExecutionEvent event) throws ExecutionException {
  68                 IEditorPart editor = HandlerUtil.getActiveEditor(event);
  69
  70                 if (editor.isDirty()){
  71                         boolean proceed = MessageDialog.openQuestion(null,
  72                                         "Save changes", "You have made changes that must be saved before you can delete the node. Would you like to proceed?");
  73                         if (!proceed) {
  74                                 return null;
  75                         }else{
  76                                 editor.doSave(EditorUtil.getMonitor());
  77                         }
  78                 }
  79                 if (editor instanceof KeyEditor) {
  80                         IPolytomousKeyEditorPage editorPage = (IPolytomousKeyEditorPage) ((KeyEditor) editor)
  81                                         .getActiveEditor();
  82
  83                         IStructuredSelection selection = (IStructuredSelection) HandlerUtil
  84                                         .getCurrentSelection(event);
  85
  86                         if (selection.getFirstElement() instanceof PolytomousKeyNode) {
  87                                 try {
  88                                         String label = event.getCommand().getName();
  89                                         IUndoContext undoContext = EditorUtil.getUndoContext();
  90
  91                                         for (Object element : selection.toArray()) {
  92                                                 PolytomousKeyNode keyNode = HibernateProxyHelper.deproxy(element, PolytomousKeyNode.class);
  93
  94                                                 AbstractPostOperation operation = new DeleteNodeOperation(
  95                                                                 label, undoContext, keyNode, editorPage);
  96                                                 EditorUtil.executeOperation(operation);
  97                                         }
  98
  99                                 } catch (NotDefinedException e) {
 100                                         MessagingUtils.warn(getClass(), "Command name not set.");
 101                                 }
 102                         } else {
 103                         MessageDialog.openInformation(
 104                                 EditorUtil.getShell(),
 105                                 "No Key Node Selected",
 106                                 "Please right-click on a specific key node to delete a key node.");
 107                         }
 108                 }
 109
 110                 return null;
 111         }
 112
 113     /**
 114      * {@inheritDoc}
 115      */
 116     @Override
 117     public IStatus allowOperations(ExecutionEvent event) {
 118         IEditorPart editor = HandlerUtil.getActiveEditor(event);
 119
 120         if (editor instanceof KeyEditor) {
 121             editorPage = (IPolytomousKeyEditorPage) ((KeyEditor) editor)
 122                     .getActiveEditor();
 123
 124             if (editorPage instanceof PolytomousKeyListEditor) {
 125                 PolytomousKeyListEditor klEditor = (PolytomousKeyListEditor) editorPage;
 126                 IStructuredSelection selection = (IStructuredSelection) HandlerUtil.getCurrentSelection(event);
 127                     if (selection.getFirstElement() instanceof PolytomousKeyNode) {
 128                         nodeToBeDeleted = (PolytomousKeyNode) selection.getFirstElement();
 129                     } else {
 130                         return new Status(IStatus.ERROR,
 131                                 "unknown",
 132                                 PolytomousKeyEditorLabels.NO_KEY_NODE_FOR_CHILD_SELECTED_MESSAGE);
 133                     }
 134                 }
 135
 136         }
 137         return Status.OK_STATUS;
 138     }
 139
 140     /**
 141      * {@inheritDoc}
 142      */
 143     @Override
 144     public AbstractOperation prepareOperation(ExecutionEvent event) {
 145         IUndoContext undoContext = EditorUtil.getUndoContext();
 146         String label = "";
 147         try {
 148             label = event.getCommand().getName();
 149         } catch (NotDefinedException e) {
 150             MessagingUtils.warn(getClass(), "Command name not set.");
 151         }
 152         return new DeleteNodeOperation(label, undoContext, nodeToBeDeleted, editorPage);
 153     }
 154
 155     /**
 156      * {@inheritDoc}
 157      */
 158     @Override
 159     public void onComplete() {
 160         // TODO Auto-generated method stub
 161
 162     }
 163
 164 }